Don't know if I have any more light to shed, sounds like you've already considered everything I might think to suggest.

Only other thing would be if the B2 reaction valve pin somehow wasn't properly engaged. (or somehow fell out while the brake band lug wasn't being pushed against it during installation of the new piston)

Did you install the new piston and seals with the tranny still in the car? I would think getting the old lip seal and piston guide out would result in some movement of the B2 band. Maybe that allowed the reaction valve pin to disengage.

The possible reaction valve pin problem is a long shot but its the only other thing I can think of right now.

What were the symptoms that lead to the replacement of the B2 piston?


J. M. van Swaay

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1994 E320 Wagon, 230,000 miles
1995 E320 Sedan, 106,000 miles
1994 E500 Sedan, 79,000 miles